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Optogenetic induction of apoptosis in zebrafish larvae. Time-lapse fluorescence confocal microscopy showing a zebrafish keratinocyte expressing opto-zfCaspase-8 (red) and stimulated with blue light. Left, the brightfield channel. Apoptotic cell is fragmented into apoptotic bodies, which are retained within the monolayer. Scale bar, 20 µm.
